An efficient one-pot synthesis of anthraquinones and tetracenediones was achieved by l-proline catalyzed benzannulation of commercially available 1,4-naphthoquinones or 1,4-anthracenedione with a variety of α,β-unsaturated aldehydes in good to excellent yield.
One-Pot Synthesis of α-Iodo-Substituted α,β-Unsaturated Aldehydes from Propargylic Alcohols.